Malicious PDF — malware analysis report

Static analysis result for SHA-256 4590995e47b76e18…

MALICIOUS

PDF

56.1 KB Created: 2020-08-03 23:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e30d31f504cfa0584b4eba9cc0d7af56 SHA-1: 7655ef7aadd357c1095f901115656b257fa77bf9 SHA-256: 4590995e47b76e1840801e7ebc7d14ad173c4f2679c7ed8a18627ae89b896451
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a link farm and a direct link to a known malicious redirector, indicating an attempt to direct users to harmful content. The document body, though partially corrupted, includes the URL 'https://ttraff.cc/pify?keyword=bronconeumonia+en+bovinos+pdf', which is flagged as a malicious redirector. The presence of numerous external links, many pointing to Shopify domains hosting PDFs, suggests a link farm designed to manipulate search engine results or distribute content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=bronconeumonia+en+bovinos+pdf
    • http://files.changingfutures.org.uk/uploads/1/3/1/4/131438784/e3ab3be6dc5b17.pdf
    • http://files.artystafoto.com/uploads/1/3/1/4/131405977/xisup_kuxeletineji_vusudutopas_wigogadanowike.pdf
    • http://files.pauljmdavis.com/uploads/1/3/0/7/130776611/vidowopogakerasap.pdf
    • http://files.johncheck1.com/uploads/1/3/2/7/132741535/gajev-saruxakoxofomuk.pdf
    • https://cdn.shopify.com/s/files/1/0429/1277/6351/files/78625364880.pdf
    • https://cdn.shopify.com/s/files/1/0430/0131/5491/files/mifakusijabok.pdf
    • https://cdn.shopify.com/s/files/1/0434/5089/2454/files/how_many_covalent_bonds_can_nitrogen_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/3707/3314/files/98056370841.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6925/files/takasatalemoluwoduja.pdf
    • https://cdn.shopify.com/s/files/1/0439/0119/0299/files/dopigeteralojufugivo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5074/5512/files/30115365744.pdf
    • https://cdn.shopify.com/s/files/1/0432/2308/9307/files/52817332892.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5671/files/67969773860.pdf
    • https://cdn.shopify.com/s/files/1/0437/6287/6565/files/37930903073.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008abc.bin
b5d8b727de0e29b6c79da54462e3fa6986e01dcc500c28f81d7ac33344ccbe50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ABC 5320 bytes
font_01_sfnt_off00009ca6.bin
2e26c1d8569881ee1581aa79d2be71cb9fc073504a44d3ec930fa4fd38ce8344		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CA6 12132 bytes
font_02_sfnt_off0000c40a.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC40A 4324 bytes

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